Allegro MicroSystemsAMT49406GESSRMotor Controller and Driver ICs

The AMT49406 is a 3-phase, sensorless, brushless DC (BLDC) motor driver (gate driver) which can operate from 5.5 to 50 V—Allegro’s first QuietMotion solution. The AMT49406 is ideal for ceiling fans, pedestal fans, bathroom exhaust fans and home appliance fans and pumps.

A field-oriented control (FOC) algorithm is fully integrated to achieve the best efficiency and acoustic noise performance. The device optimizes the motor startup performance in a stationary condition, a windmill condition, and even in a reverse windmill condition.

Motor speed is controlled through analog, PWM, or CLOCK input. Closed-loop speed control is optional, and RPM-to-clock frequency ratio is programmable.

A simple I2C interface is provided for setting motor-rated voltage, rated current, rated speed, resistance, and startup profiles.

The AMT49406 is available in a 24-contact 4 mm × 4 mm QFN with exposed thermal pad (suffix ES) and a 24-lead TSSOP with exposed thermal pad (suffix LP). These packages are lead (Pb) free, with 100% matte-tin leadframe plating.

Applications

• •  Ceiling fans
• •  Pedestal fans
• •  Bathroom exhaust fans
• •  Home appliance fans and pumps

Typical Application

Features and Benefits

• •  Coding-free, sensorless field-oriented control (FOC)
• •  Proprietary non-reverse fast startup
• •  Soft-On Soft-Off (SOSO) for quiet operation
• •  Analog / PWM / Clock mode speed control
• •  Closed-loop speed control
• •  Configurable current limit
• •  Windmill startup operation
• •  Lock detection
• •  Short-circuit protection (OCP)
• •  Brake and direction inputs

Related Products

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